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[Launchpad Bug Tracker <1718444@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-4ubuntu21.2

---------------
systemd (229-4ubuntu21.2) xenial; urgency=medium

  [ Dimitri John Ledkov ]
  * udev: Mark ndb devices as inactive until connected. (LP: #696435)
  * networkd: in dhcp, change UseMTU default to true, to accept DHCP provided MTU by default.
    (LP: #1717471)
  * sysctl: apply parameters in-order, instead of randomly. (LP: #1718444)
  * networkd: apply promote_secondaries, to make DHCP lease changes work.
    (LP: #1721223)
  * shutdown: sync filesystems, before going into a killing spree.
    (LP: #1722481)
  * sysctl: do not fail, when cannot apply sysctl changes due to read-only sysfs in containers.
    (LP: #1734409)
  * networkd,wait-online: add RequiredForOnline to mark mandatory/optional links for boot.
    (LP: #1737570)

  [ David Glasser ]
  * journald: don't reduce BurstRateLimit on low disk space (LP: #1732803)

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Wed, 21 Feb 2018 13:46:37
+0000

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1718444

Title:
  systemd-sysctl in Xenial is not obeying the order of the sysctls

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * sysctls are applied out of order

  [Test Case]

   * Monitor that sysctls are applied in-order, instead of out of order
  / random order.

  [Regression Potential]

   * Cherrypick of an upstream patch which is present in v232+ and in
  use in Ubuntu in later releases. The code changes are minimal,
  updating s/Hashmap/OrderedHashmap/ which is implemented and available
  in xenial's systemd.

  https://github.com/systemd/systemd/commit/886cf982d3018f7451f0548dadbc05bd2d583bb6

  [Other Info]
   
   * Original bug report.

  systemd-sysctl in Xenial forces itself over procps by shipping a link
  for procps.service to systemd-sysctl.service. However, it does not
  obey the order both of the files and also of the sysctls within the
  files. Instead it uses a simple hashmap. As it turns out that's fixed
  upstream and systemd master uses an ordered hashmap because of this,
  which at least preserves order within single files. Traditionally
  files in sysctl.d have been prefixed with numbers to ensure an order
  and that's now completely non-deterministic on Xenial.

  Relevant upstream commit:
  https://github.com/systemd/systemd/commit/886cf982d3018f7451f0548dadbc05bd2d583bb6

  Note that conf_files_list_nulstr in master sorts the configuration
  files using strcmp, so even order of configuration files should be
  obeyed.

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